package com.hospicpc.demos.websocket;

import com.hospicpc.demos.websocket.pojo.Message;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.GetResponse;
import lombok.extern.slf4j.Slf4j;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.ByteArrayInputStream;
import java.io.ObjectInputStream;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArraySet;

/**
 * @author fengtianhao
 * @version 1.0
 */
@Component
@Slf4j
@ServerEndpoint("/websocket/{userId}")  // 接口路径 ws://localhost:8080/webSocket/userId;

public class WebSocket {
    @Autowired
    private RabbitTemplate rabbitTemplate;

    //与某个客户端的连接会话，需要通过它来给客户端发送数据
    private Session session;
    /**
     * 用户ID
     */
    public String userId;


    //concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。
    //虽然@Component默认是单例模式的，但springboot还是会为每个websocket连接初始化一个bean，所以可以用一个静态set保存起来。
    //  注：底下WebSocket是当前类名
    public static CopyOnWriteArraySet<WebSocket> webSockets = new CopyOnWriteArraySet<>();
    // 用来存在线连接用户信息
    private static ConcurrentHashMap<String, Session> sessionPool = new ConcurrentHashMap<>();

    /**
     * 获取所有在线用户的id
     *
     * @return 集合id
     */
    public Set<String> getAllOnlineUsers() {
        return sessionPool.keySet();
    }

    /**
     * 链接成功调用的方法
     */
    @OnOpen
    public void onOpen(Session session, @PathParam(value = "userId") String userId) {
        try {
            this.session = session;
            this.userId = userId;
            webSockets.add(this);
            sessionPool.put(userId, session);
            log.info("【websocket消息】有新的连接，总数为:" + webSockets.size());

            // 用户上线，检查RabbitMQ中是否有待发送的消息
            ConnectionFactory factory = new ConnectionFactory();
            factory.setHost("localhost");
            try (Connection connection = factory.newConnection();
                 Channel channel = connection.createChannel()) {
                String targetUserId = userId;
                while (true) {
                    GetResponse response = channel.basicGet("DirectQueue", true);
                    if (response == null) {
                        break;
                    }
                    byte[] body = response.getBody();
                    try (ObjectInputStream ois = new ObjectInputStream(new ByteArrayInputStream(body))) {
                        Map<String, String> messageMap = (Map<String, String>) ois.readObject();
                        if (targetUserId.equals(messageMap.get("messageId"))) {
                            sendOneMessage(messageMap.get("messageId"), messageMap.get("messageData"), messageMap.get("createTime"),messageMap.get("nickName"));
                        }
                    }
                }
            }

        } catch (Exception e) {
            log.error("Error opening WebSocket connection", e);
        }
    }
    /**
     * @param userId 用户id
     * @return {@link List}<{@link String}>
     */

    public static boolean isUserOnline(String userId) {
        return sessionPool.containsKey(userId);
    }


    /**
     * 链接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        try {
            webSockets.remove(this);
            sessionPool.remove(this.userId);
            log.info("【websocket消息】连接断开，总数为:" + webSockets.size());
        } catch (Exception e) {
        }
    }

    /**
     * 收到客户端消息后调用的方法
     *
     * @param message
     */
    @OnMessage
    public void onMessage(String message) {
        log.info("【websocket消息】收到客户端消息:" + message);
    }

    /**
     * 发送错误时的处理
     *
     * @param session
     * @param error
     */
    @OnError
    public void onError(Session session, Throwable error) {

        log.error("用户错误,原因:" + error.getMessage());
        error.printStackTrace();
    }


    // 此为广播消息
    public void sendAllMessage(String message) {
        log.info("【websocket消息】广播消息:" + message);
        for (WebSocket webSocket : webSockets) {
            try {
                if (webSocket.session.isOpen()) {
                    webSocket.session.getAsyncRemote().sendText(message);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    // 此为单点消息
    public void sendOneMessage(String userId, String message, String createTime,String nickName) {
        Session session = sessionPool.get(userId);
        if (session != null && session.isOpen()) {
            try {
                log.info("【websocket消息】 单点消息:" + message + "  " + createTime + " " + "来自用户" + nickName);
                session.getAsyncRemote().sendText(createTime + " " + nickName + " " + message);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    // 此为单点消息(多人)
    public void sendMoreMessage(String[] userIds, String message) {
        for (String userId : userIds) {
            Session session = sessionPool.get(userId);
            if (session != null && session.isOpen()) {
                try {
                    log.info("【websocket消息】 单点消息:" + message);
                    session.getAsyncRemote().sendText(message);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }

    }


}
